90FScaper
New Member
Hi. I have a 90F heavily planted aquarium. Ive just returned from a week away and I have lost 8 of my 10 harlequin rasboras ! I have a shoal of 12 ember tetras and ottos and shrimp that are perfectly fine. I have carried out an NTLabs water test as I thought it might be a water issue but all is good. I wondered if harlequins are more sensitive to co2 than other fish ? I noticed that the bubble count rate had increased (thinking the needle valve adjuster may have been knocked by my neighbour). The drop checker was still a light green suggesting it was still Ok. Im just a bit perplexed.
